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CHAPTER 2: FREQUENCY DISTRIBUTIONS - Coggle Diagram
CHAPTER 2: FREQUENCY DISTRIBUTIONS
Frequency Distributions are tables that show how often values occur in a data set.
Frequency distributions organize large amounts of data into a single form.
Frequency means the number of times a value appears
Frequency distributions can be used for qualitative and quantitative data.
Skewed distribution has data clustered more on one side.
Bar graphs are more used for categorial frequency distributions
Frequency distributions help show outliers and odd values.
Cumulative frequencies shows the total frequency accumulated
Frequency distribution shapes help describe the overall pattern of data
Group FD's organize data into intervals and classes
The lower class limit is the smallest value in a class interval.
The upper class limit is the largest value in a class interval
Histograms are graphs commonly created from frequency distributions.
Frequency distributions make it easier to identify patterns in data.
A frequency polygon is another graph used to display frequency data.
Frequency distributions are commonly used in research and surveys
Class width is the difference between the upper and lower class limits.
Nearly all distributions can be classified as being either symmetrical or skewed.
the shape of a distribution is defined by an equation that prescribes the exact relationship between each X and Y value on the graph.
One commonly occurring population distribution is the normal curve.
A bar graph is essentially the same as a histogram, except that spaces are left between adjacent bars.
For ordinal scales, separate bars are used because you cannot assume that the categories are all the same size.
Although graphs are intended to provide an accurate picture of a set of data, they can be used to exaggerate or misrepresent a set of scores.
Individual scores, or X values, are called raw scores. By themselves, raw scores do not provide much information.